<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/logo2.png" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="backLogin()">回到登录页</el-button>
    </el-header>
    <!-- 内容区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse? '64px':'200px'">
          <div class='toggle-button' @click="toggleCollapse()">||||</div>
          <!-- 侧边栏菜单区域 -->
          <el-menu
            background-color="#545c64"
            text-color="#fff"
            active-text-color="#409BFF"
            :unique-opened='true'
            :collapse='isCollapse' 
            :collapse-transition ='false'
            router
            :default-active='activePath'
          >
          <!-- 一级菜单 -->
            <el-submenu :index="item.id+''" v-for='item in menulist' :key='item.id'>
                <!-- 一级菜单模板 -->
              <template slot="title">
                  <!--  图标 -->
                <i :class="iconObj[item.id]"></i>
                <!-- 文本 -->
                <span>{{ item.authName }}</span>
              </template>
              <!-- 二级菜单 -->
                <el-menu-item @click="saveNavstate('/'+subItem.path)" :index="'/'+subItem.path" v-for='subItem in item.children' :key='subItem.id'>
                    <template slot="title">
                    <!--  图标 -->
                    <i class="el-icon-menu"></i>
                    <!-- 文本 -->
                    <span>{{ subItem.authName }}</span>
                    </template>
                </el-menu-item>
            </el-submenu>
          </el-menu>
      </el-aside>
      <!-- 内容显示区 -->
      <el-main>
          <!-- 路由占位符 -->
          <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
    data() {
        return {
            // 左侧菜单数据
            menulist:[],
            // 菜单显示与隐藏
            isCollapse:false,
            iconObj:{
                125:'iconfont icon-user',
                103:'iconfont icon-tijikongjian',
                101:'iconfont icon-shangpin',
                102:'iconfont icon-danju',
                145:'iconfont icon-baobiao'
            },
            // 被激活的链接地址
            activePath:''
        }
    },
    created(){
        this.getMenuList()
        this.activePath = window.sessionStorage.getItem('activePath')
    },
  methods: {
    backLogin() {
      window.sessionStorage.clear();
      this.$router.push("/login");
    },
    // 获取表单数据
    async getMenuList (){
        const {data: res} = await this.$http.get('menus')
        // console.log(res);
         if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
         this.menulist = res.data
    },
    // 点击按钮切换菜单的显示与隐藏
    toggleCollapse () {
        this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavstate (activePath) {
        window.sessionStorage.setItem('avtivePath', activePath)
        this.activePath = activePath
    }
  }
};
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #545c64;
  display: flex;
  justify-content: space-between;
  align-items: center;
  div {
    display: flex;
    align-items: center;
    font-size: 35px;
    color: #eee;
    span {
      margin-left: 10px;
    }
  }
}

.el-aside {
  background-color: #545c64;
  .el-menu {
      border-right: none;
  }
  .toggle-button {
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.3em;
    cursor: pointer;
  }
}

.el-main {
  background-color: #eee;
}
.iconfont {
    margin-right: 5px;
}
</style>
